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DESCRIPTION JP2002354573

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DESCRIPTION JP2002354573
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
superdirective speaker device for directional emission of audible sound, and more particularly to
a superdirective speaker device for providing information by audio announcement of audible
sound on a platform of a station. It is a thing.
[0002]
2. Description of the Related Art For example, for a large number of unspecified users on the
platform of a station (hereinafter referred to as "home"), information from the station such as
information on arrival and arrival of trains, caution instructions for avoiding danger, guidance of
lost The means at the time of providing is performed by the audio | voice information (Hereafter,
it is called audio | voice announcement) radiated from the normal speaker apparatus.
[0003]
A voice announcement is an audible sound that belongs to an audible band (about 20 Hz to 20
kHz) that can be heard by humans, and generally has a certain band rather than a single
frequency.
The words of the station staff via a microphone, the voice language recorded on the tape
recorder, music, buzzer, chime, etc. are given as examples of voice announcement.
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[0004]
7 and 8 show the configuration of the conventional speaker device installed in the station's
home, FIG. 7 is a side view of the speaker device, and FIG. 8 is a speaker device in a state where a
part of the protective net is removed. It is a front view.
[0005]
In FIGS. 7 and 8, 100 is a housing of the speaker device, 101 is a plurality of speaker units fixed
at an arbitrary position in the housing 100, 102 is a protective net for protecting the speaker
unit 101, and 103 is a speaker unit 101. The connected speaker cords 104 are an external
terminal board connected to a sound source (not shown).
[0006]
Next, the operation will be described.
An announcement signal from a sound source connected to the external terminal board 104 is
supplied to the speaker unit 101 fixed to the housing 100 via the speaker cord 103.
The speaker unit 101 vibrates in response to the frequency of the announcement signal, and the
vibration generates a voice announcement and propagates it into the air. The directivity
characteristic of the speaker device at this time is as shown in FIG. 9, and reference numeral 105
represents the directivity characteristic of the conventional speaker device.
[0007]
As can be seen from FIG. 9, the voice announcement is radiated by the directivity characteristic
105, and spread and radiated from the speaker unit 101 in various directions other than the
front direction (0 degree direction in FIG. 9) of the speaker unit 101. As a result, guidance
information from the station is provided as a voice announcement to a wide range of unspecified
home users.
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[0008]
However, when different voice announcements are simultaneously radiated from the adjacent
homes or from each speaker device of the same home due to the directivity characteristic 105 of
FIG. 9, the voice announcements are mixed and difficult to be heard.
[0009]
For example, when a warning instruction for danger avoidance is given to a user in a dangerous
situation on the home with the conventional speaker device as the train arrives and departs,
mixed with the simultaneous voice announcement of train arrival and arrival. It will end up.
In addition, since the voice announcement is emitted to the user of the whole home, it may
become a vague attention instruction and it may be heard.
[0010]
The above problems can be solved by providing guidance information and a caution instruction
by directional radiation of voice announcements with sharp directional characteristics only in a
target direction / object. However, since voice announcements are generally audible sounds
having a band, it is very difficult to set up various parameters for directional emission of voice
announcements in conventional speaker devices.
[0011]
SUMMARY OF THE INVENTION Since the conventional speaker device is configured as described
above, there is a problem that it is difficult to directivityally emit an audible sound having a band.
[0012]
In addition, the conventional speaker device has a problem that it becomes difficult to hear the
information content by the voice announcement when a plurality of different voice
announcements are radiated simultaneously.
[0013]
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In particular, when warning instructions are given to users in dangerous situations by voice
announcement, the presence of users in dangerous situations is surely grasped, and in response
to this, voice announcements in warning instructions promptly and properly Need a speaker
device to provide
[0014]
And, unfortunately, there are rare users under special circumstances just before trying to get into
a train.
If you have a speaker device that can directivityally emit voice announcements only to this user,
you can persuade using voice announcements to ensure that the users under such special
situations are not only positively detected, but also to prevent the situation from getting worse
due to panic or wild horse It is highly likely that you can avoid serious damage both personally
and socially.
[0015]
The present invention has been made to solve the problems as described above, and it is an
object of the present invention to construct a superdirective speaker device that directionally
radiates an audible sound having a band.
[0016]
Another object of the present invention is to provide a superdirective speaker device capable of
reliably listening to information content by voice announcement even when a plurality of
different voice announcements are radiated simultaneously.
[0017]
Furthermore, the present invention provides a super-directional speaker device that reliably
recognizes the presence of users in dangerous situations and users in special situations, and
provides prompt and accurate voice announcements of attention instructions accordingly.
Intended to be configured.
[0018]
SUMMARY OF THE INVENTION The superdirective speaker device according to the present
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invention controls the acoustic emission characteristics of an audible sound signal by using a
sound source generating an audible sound signal and a carrier wave belonging to an ultrasonic
band. An acoustic radiation controller, and a speaker for receiving an audible sound signal whose
acoustic radiation characteristics are controlled by the acoustic radiation controller and emitting
an audible sound are provided.
[0019]
In the superdirective speaker device according to the present invention, the acoustic emission
controller includes the carrier generation unit configured to generate a carrier wave belonging to
the ultrasonic band, and the addition unit configured to add the carrier to an audible sound
signal generated by a sound source. It is a thing.
[0020]
In the superdirective speaker device according to the present invention, the speaker includes a
plurality of closely arranged transducers, and an audible sound signal whose acoustic radiation
characteristic is controlled by the acoustic radiation controller is input to each of the transducers.
It is
[0021]
The superdirective speaker device according to the present invention is applied to a platform of a
station to emit an audible sound as a voice announcement to a user of the platform.
[0022]
The superdirectional speaker device according to the present invention includes an ultrasonic
wave receiver unit that outputs a sensor signal according to the reception level of ultrasonic
waves that are carrier waves emitted from the speaker, and is closer to the line than the warning
line of the platform. At least one speaker and an ultrasonic wave receiver unit are provided on
the platform so that the ultrasonic waves are blocked by the user on the platform.
[0023]
The superdirective speaker device according to the present invention compares the preset
specified level with the level of the sensor signal, and controls the sound source to output an
announce signal when the level of the sensor signal is lower than the specified level. Equipped
with a container.
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[0024]
In the superdirective speaker device according to the present invention, the speaker is provided
with a base on which a plurality of transducers are arranged, and the base is formed in a
rectangular shape having a long side in the vertical direction.
[0025]
The superdirective speaker device according to the present invention includes a monitoring
monitor camera that monitors the platform by changing the viewing direction, and incorporates
the speaker in the monitoring monitor camera so that the radiation direction of the voice
announcement matches the viewing direction. It is something like that.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present
invention will be described.
Embodiment 1
1 and 2 respectively show a state in which the superdirective speaker device according to
Embodiment 1 of the present invention is applied to a platform of a train station, FIG. 1 is a front
view, and FIG. 2 is a top view.
[0027]
In FIGS. 1 and 2, 1 is a platform for the station (hereinafter referred to as a home), 2 is a track, 3
is a ceiling of the home 1, 4 is a train running on the track 2, 5 is provided near the track 2 of the
home 1. A warning line for the track 2 by a braille block and a yellow line, 6 is a home 1 user.
The user 6 stands on the home 1 closer to the track 2 than the warning line 5 and is in a
dangerous state due to arrival and departure of the train 4 and the like. It is in.
[0028]
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7 is a monitor camera with variable monitoring direction installed at one end of the home 1, 8 is
a monitor camera unit of the monitor camera 7 for monitoring, 9 is a speaker of superdirective
speaker device, and 10 is a speaker 9 It is an ultrasonic wave belonging to an ultrasonic wave
band of 20 kHz or more.
The speaker 9 is incorporated in the monitor camera 7 for monitoring, and sharply radiates
ultrasonic waves 10 and an audio announcement (audible sound) in a direction coincident with
the line of sight of the monitor camera unit 8.
[0029]
Reference numeral 11 denotes an ultrasonic wave receiver unit installed at the other end of the
home 1, and 12 denotes a plurality of ultrasonic wave sensors installed in the ultrasonic wave
receiver unit 11.
The ultrasonic sensor 12 receives the ultrasonic wave 10 from the speaker 9 and outputs a
sensor signal of a voltage level according to the reception level of the ultrasonic wave 10.
[0030]
The speaker 9 of the monitoring monitor camera 7 continuously emits the ultrasonic wave 10 so
that the ultrasonic wave 10 is blocked by the user 6 on the home 1 standing closer to the line 2
than the warning line 5 It propagates to the ultrasonic sensor 12 of the ultrasonic wave receiver
unit 11.
The superdirective speaker device according to the first embodiment is configured to emit a
voice announcement together with the ultrasonic wave 10 only to the user 6 who blocks the
ultrasonic wave 10.
[0031]
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Then, each structure of the superdirective speaker apparatus by Embodiment 1 of this invention
is demonstrated.
First, the speaker 9 of the superdirective speaker device will be described.
3 and 4 show the configuration of the speaker 9, respectively. FIG. 3 is a side view, and FIG. 4 is a
front view.
The same reference numerals as in FIGS. 1 and 2 denote the same or corresponding components.
[0032]
In FIGS. 3 and 4, reference numeral 13 denotes a rectangular base, 14 denotes a plurality of
transducers arranged in alignment with the base 13, and 15 denotes a signal supply line
connected to each transducer 14.
The vibrator 14 of the speaker 9 is a thin-film diaphragm of small diameter such as ceramic, and
vibrates in the ultrasonic band from its structural condition, and radiates the ultrasonic wave 10
and the voice announcement by the configuration and operation described later.
[0033]
A plurality of transducers 14 are arranged on the pedestal 13 in order to improve the sound
pressure level of the sound wave emitted from the speaker 9.
The arrangement conditions regarding the vibrator 14 are not particularly limited, and the
speaker 9 can be shaped to an appropriate size according to the number of vibrators 14, and the
total output sound pressure level can be adjusted. .
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[0034]
When applied to the superdirective speaker device of FIGS. 1 and 2, the arrangement of the
transducers 14 is devised as follows.
That is, as shown in FIG. 4, the rectangular shape of the pedestal 13 has long sides in the vertical
direction, and the transducers 14 are arranged in accordance with the rectangular shape of the
pedestal 13, so ultrasonic waves 10 and voice announcements are made. Are radiated from the
speaker 9 with a radiation width M in the vertical direction.
[0035]
Next, the overall configuration of the superdirective speaker device will be described.
FIG. 5 is a diagram showing the configuration of the superdirective speaker device according to
the first embodiment of the present invention. The same reference numerals as in FIGS. 1 to 4
denote the same or corresponding components.
[0036]
In FIG. 5, reference numeral 16 denotes a sound source, which outputs an announcement signal
(audible sound signal) that electrically generates a speech announcement (audible sound)
corresponding to the usage condition of the user 6. Reference numeral 17 denotes a control
stage, which controls the acoustic radiation characteristics (directivity) of the announcement
signal generated by the sound source 16 using the carrier wave belonging to the ultrasonic band,
and the sound source according to the voltage level of the sensor signal from the ultrasonic
sensor 12 Control 16
[0037]
The control stage 17 is provided with an acoustic radiation controller 18 and a comparator 19. In
the acoustic radiation controller 18, 20 is a carrier wave generator and 21 is an adder. With this
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9
simple configuration, the acoustic radiation characteristic (directivity characteristic) of the voice
announcement can be controlled. The carrier generation unit 20 generates a carrier in the
ultrasonic band, and the carrier is emitted from the speaker 9 to become the ultrasonic wave 10.
Further, when the sound source 16 generates an announcement signal, the addition unit 21 adds
the announcement signal and the carrier wave and outputs the result.
[0038]
Further, the comparator 19 of the control stage 17 compares the voltage level of the sensor
signal from the ultrasonic sensor 12 with the prescribed level, and the announcement signal of
the sound source 16 is added to the adding unit 21 of the acoustic radiation controller 18
according to the comparison result. Control whether to supply An amplifier 22 receives a carrier
wave and an announcement signal from the adding unit 21, amplifies them, and outputs the
amplified signal to each vibrator 14 of the speaker 9 through the signal supply line 15.
[0039]
Based on FIGS. 1 to 5 described above, the operation of the superdirective speaker device
according to the first embodiment of the present invention will be described. First of all, the
operation of the superdirective speaker device for directional emission of voice announcements
will be described.
[0040]
In FIG. 5, the announcement signal from the sound source 16 is input to the acoustic emission
controller 18 of the control stage 17. In the acoustic radiation controller 18, the carrier wave in
the ultrasonic band is generated by the carrier wave generation unit 20, the carrier wave is
added to the announcement signal by the addition unit 21, and the resultant signal is output
from the acoustic radiation controller 18.
[0041]
The output of the acoustic emission controller 18 is amplified by the amplifier 22 and is input to
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each transducer 14 of the speaker 9 through the signal supply line 15. The transducer 14
vibrates in response to the output of the amplifier 22 and emits an audio announcement with the
ultrasound 10.
[0042]
The carrier wave generated by the carrier wave generation unit 20 becomes the ultrasonic wave
10 when emitted from the vibrator 14 and exhibits sharp directional characteristics, so that the
announcement signal added to the carrier also has a voice pattern with the ultrasonic wave 10
having a sharp directional characteristic. And become emitted from the oscillator 14.
[0043]
FIG. 6 is a diagram showing the directivity characteristic of the superdirective speaker device
according to the first embodiment of the present invention.
In FIG. 6, reference numeral 23 denotes a very linear directivity characteristic of the voice
announcement emitted from the speaker 9. The voice announcement is sharply directed radiation
with directivity characteristics 23 only in the direction toward the speaker 9 (the normal
direction of the pedestal 13 in FIG. 4 corresponds to the 0 ° direction).
[0044]
As described above, the acoustic emission controller 18 adds the carrier wave to the
announcement signal so that the voice announcement as well as the ultrasonic wave from the
vibrator 14 is directionally radiated, so that the pointing characteristic of the ultrasonic wave is
used to make a sharp pointing The voice announcement of characteristic 23 can be provided to
the user 6. Since the ultrasonic wave 10 is an inaudible sound that can not be heard by human
beings, it does not interfere with the user 6's hearing even if it is added to the audio
announcement of the audible sound.
[0045]
Then, by using the superdirective speaker device constituted by the sound source 16, the
acoustic radiation controller 18, the amplifier 22 and the speaker 9 as information providing
means of the home 1, directional announcement of voice announcement in the direction of the
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home 1 is aimed. As a result, voice announcements provided by different superdirective speaker
devices do not mix with each other, and the information content provided can be easily listened
to.
[0046]
Next, the operation of the superdirective speaker device applied to the home 1 will be described.
The superdirective speaker device shown in FIGS. 1 and 2 is particularly for giving a caution
instruction to the user 6 in a dangerous situation or persuading the user 6 in the special situation
described above.
[0047]
As described above, the ultrasonic waves 10 directed to the ultrasonic wave receiver unit 11 are
blocked when the user 6 is present. The ultrasonic sensor 12 outputs a sensor signal of a voltage
level corresponding to the reception level of the ultrasonic wave 10 to the comparator 19 of the
control stage 17, and the comparator 19 compares the voltage level of the sensor signal with a
preset specified level. Do. This prescribed level is determined to be lower than the voltage level of
the sensor signal in the state where the ultrasonic wave 10 is not blocked on the home 1.
[0048]
Therefore, when the user 6 is present, the ultrasonic wave 10 to the ultrasonic sensor 12 is
interrupted to lower the voltage level of the sensor signal, and the voltage level of the sensor
signal is reduced by comparison with the prescribed level in the comparator 19. A drop is
detected. On the other hand, when the user 6 does not exist, the ultrasonic wave 10 is received
by the ultrasonic sensor 12 without being blocked, and the voltage level of the sensor signal
shows a high value, and the voltage level of the sensor signal at this time Becomes a value
exceeding the prescribed level in the comparator 19.
[0049]
That is, if the home 1 is in a normal state where there is no safety management problem, a sensor
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signal with a voltage level higher than the specified level is detected by the comparator 19 and if
the user 6 is present in the dangerous state, Sensor signals at small voltage levels are
respectively detected by the comparator 19.
[0050]
As described above, in the first embodiment, the so-called "supersonic monitoring line" is
generated by the ultrasonic wave 10 by the speaker 9, the ultrasonic sensor 12, and the
comparator 19, and the presence or absence of the user 6 is detected and determined. doing.
If the normal state where the presence of the user 6 is not detected, it is determined that this
state is safe and a normal voice announcement is provided to the home 1.
[0051]
When the presence of the user 6 is detected, the comparator 19 controls the sound source 16 to
output an announcement signal of a caution instruction from the sound source 16 in accordance
with the arrival timing of the train 4. The announcement signal at this time is, for example, "Soon,
a train will come in on the △ line. It's dangerous, so please drop down to the inside of the yellow
line. The announcement signal from the sound source 16 is input to the acoustic emission
controller 18, and is added to the carrier by the adder of the acoustic emission control unit and
amplified by the amplifier 22 as described in FIG. Together with 10, only the user 6 is directed
radiated as a voice announcement.
[0052]
That is, since the super-directional speaker device of FIGS. 1 and 2 is designed to radiate the
voice announcement of the attention instruction only to the user 6 who blocks the ultrasonic
wave 10, listening is easier compared to the prior art. It can also prompt the user 6 to notice
instructions.
[0053]
Here, when providing the voice announcement to the user 6, since the height of the user 6
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generally has individual differences, the voice announcement is made to the ears of both the
short user 6 and the tall user 6. Must be considered to be heard.
Therefore, in the first embodiment, as shown in FIGS. 3 and 4, the plural vibrators 14 are
arranged in accordance with the rectangular shape of the pedestal 13 of the speaker 9, and the
height direction of the user 6 (vertical direction, vertical direction) The ultrasonic wave 10 is
emitted with a long radiation width M).
[0054]
By doing this, the short-sized user 6 listens to the voice announcement of the lower part of the
radiation width M, and the taller user 6 hears the voice announcement of the higher part of the
radiation width M. Even if the heights of the six are different, an audio announcement can be
provided.
[0055]
The radiation width M may be determined, for example, by giving a margin to the statistical
result of individual differences in height, and the vertical length of the rectangular shape of the
pedestal 13 is designed to realize the radiation width M. .
[0056]
Furthermore, in the first embodiment, the speaker 9 is incorporated in the monitoring monitor
camera 7 that performs safety management of the home 1 and the like, and the monitoring
method is not limited to the “ultrasonic monitoring line”. It is possible to grasp the state of
home 1 and to appropriately provide an accurate voice announcement accordingly.
[0057]
The monitor camera unit 8 of the monitor camera 7 for monitoring can monitor the state of the
home 1 as image data.
Since the radiation direction of the speaker 9 is made to coincide with the line-of-sight direction
of the monitor camera unit 8, in the monitoring state of the home 1 using the monitor camera
unit 8, the ultrasonic wave 10 is It is possible to change the radiation direction.
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[0058]
As a result, it is possible to provide the voice announcement only to the monitoring target, and,
for example, when finding the user 6 under the special situation, it is possible to provide the
correct voice announcement according to the behavior to be monitored.
At this time, a word of persuasion such as a station member via a microphone is output from the
sound source 16.
[0059]
In the above description, although the example in which the speaker 9 is incorporated in the
monitoring monitor camera 7 has been described, it is of course not incorporated in the
monitoring monitor camera 7 and the speaker 9 is made independent to compare the ultrasonic
wave receiver unit 11 It is also possible to create an "ultrasonic monitoring line" together with
the vessel 19.
[0060]
Furthermore, the installation position of the monitor camera 7 for monitoring incorporating the
speaker 9 is not limited to the end on the home 1, for example, a plurality of ceilings 3 of the
home 1 or pillars of the home 1 supporting the ceiling 3 You may
[0061]
Furthermore, the number of superdirective speaker devices provided with the ultrasonic wave
receiver unit 11 and the comparator 19 is not particularly limited.
For example, in the case where the home 1 is formed in a place where the track 2 curves a little,
the home 1 and the warning line 5 are also curved accordingly, and therefore a plurality of
homes 1 and the warning line 5 can be regarded as substantially straight. A plurality of
superdirective speaker devices may be provided for each of the regions, appropriately divided
into the regions of.
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15
At this time, the sound sources 16 may be shared by the superdirective speaker devices or may
be provided individually.
[0062]
Furthermore, the method of applying the superdirective speaker device according to the first
embodiment to the home 1 is not limited to the configuration shown in FIGS.
For example, the speakers 9 of a plurality of superdirective speaker devices may all be provided
on the ceiling 3 of the home 1 to radiate the voice announcement vertically downward.
[0063]
As described above, according to the first embodiment, the sound source 16 for generating the
announcement signal, the acoustic radiation controller 18 for controlling the acoustic radiation
characteristic of the announcement signal by using the carrier wave belonging to the ultrasonic
band, the acoustic Since the radiation controller 18 includes the speaker 9 that emits an
announcement signal whose sound emission characteristic is controlled as a voice
announcement, the effect of being able to directionalally radiate a voice announcement as an
audible sound having a band is obtained.
[0064]
Further, according to the first embodiment, the acoustic emission controller 18 includes a carrier
generating unit 20 that generates a carrier belonging to the ultrasonic band, and an adding unit
21 that adds the carrier to the announcement signal generated by the sound source 16. Since the
provision is made, it is possible to obtain the effect that the control of the sound radiation
characteristic of the voice announcement can be realized with a simple configuration.
[0065]
Furthermore, according to the first embodiment, the speaker 9 is provided with the plurality of
transducers 14 arranged closely and the audible sound signal whose acoustic radiation
characteristics are controlled by the acoustic radiation controller 18 is input to the transducer 14
respectively. As a result, it is possible to obtain an effect that the total output sound pressure
level can be adjusted.
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[0066]
Furthermore, according to the first embodiment, since the superdirective speaker device is
applied as the information guiding means of the station home 1, even if a plurality of different
voice announcements are simultaneously radiated from different speakers 9, The effect of being
able to hear information content by voice announcement surely is acquired.
[0067]
Furthermore, according to the first embodiment, the ultrasonic wave receiver unit 11 for
outputting a sensor signal of a voltage level corresponding to the reception level of the ultrasonic
wave 10 is provided. So that at least one speaker 9 and at least one ultrasonic wave receiver unit
11 are provided on the home 1 so that the ultrasonic wave 10 is blocked by the user 6 of FIG.
The effect of being able to grasp the existence of person 6 certainly is acquired.
[0068]
Furthermore, according to the first embodiment, the voltage level of the sensor signal is
compared with the prescribed level, and when the voltage level is lower than the prescribed level,
the comparator 19 for controlling the sound source 16 to output an audio announcement is
provided. Since the provision is made, it is possible to obtain the effect that the voice
announcement of the warning instruction can be provided promptly and properly according to
the presence of the user 6.
[0069]
Furthermore, according to the first embodiment, since the long side of the rectangular shape of
the pedestal 13 on which the transducers 14 are arranged is in the vertical direction, the
radiation width M is given to emit the ultrasonic wave 10 or the voice announcement. Thus, it is
possible to provide an audio announcement without being influenced by the individual difference
in height of the user 6.
[0070]
Furthermore, according to the first embodiment, the monitoring monitor camera 7 monitoring
the home 1 by changing the sight line direction is provided, and the speaker 9 is incorporated in
the monitoring monitor camera 7 with the radiation direction matched with the sight line
direction. Since this is done, it is possible to provide an accurate voice announcement to the
monitoring target according to the monitoring state by the monitoring monitor camera 7.
[0071]
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17
As described above, according to the present invention, an acoustic emission controller for
controlling the acoustic emission characteristics of an audible sound signal using a sound source
generating an audible sound signal and a carrier wave belonging to an ultrasonic band. And a
speaker that receives an audible sound signal whose acoustic radiation characteristics are
controlled by the acoustic radiation controller and emits an audible sound, so using ultrasonic
waves that do not interfere with the listening of the audible sound Audible sound can be emitted
in a directional manner, and an effect that directional sound can be emitted in an audible sound
having a band can be obtained.
[0072]
According to the present invention, the acoustic emission controller includes the carrier
generation unit for generating the carrier wave belonging to the ultrasonic band and the addition
unit for adding the carrier wave to the audible sound signal generated by the sound source. The
effect of being able to realize control of acoustic radiation characteristics with a simple
configuration is obtained.
[0073]
According to the present invention, the speaker is provided with a plurality of closely arranged
transducers, and an audible sound signal whose acoustic radiation characteristics are controlled
by the acoustic radiation controller is input to the transducers. The effect is obtained that the size
can be made appropriate and the total output sound pressure level can be adjusted.
[0074]
According to the present invention, the present invention is applied to a station platform to emit
an audible sound to a user of the platform as a voice announcement, so even if a plurality of
different voice announcements are simultaneously radiated from different speakers, the voice
announcement The effect of being able to surely hear the information content by
[0075]
According to the present invention, the use on the platform including the ultrasonic wave
receiver unit which outputs the sensor signal according to the reception level of the ultrasonic
wave which is the carrier wave emitted from the speaker and which is closer to the line than the
warning line of the platform Since at least one speaker and ultrasonic wave receiver unit are
provided on the platform so that the ultrasonic wave is blocked by the person, the fluctuation of
the voltage level of the sensor signal causes the user of the dangerous state to be interrupted. An
effect is obtained that the existence can be surely grasped.
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[0076]
According to the present invention, the comparator is provided to control the sound source and
output the announcement signal when the level of the sensor signal is lower than the
predetermined level by comparing the preset prescribed level with the level of the sensor signal.
As a result, according to the presence of the user in a dangerous state, an effect of being able to
provide the voice announcement of the warning instruction promptly and properly can be
obtained.
[0077]
According to the present invention, the speaker is provided with a base on which a plurality of
transducers are arranged, and the base is formed in a rectangular shape having long sides in the
vertical direction. The effect is that the voice announcement can be provided regardless of the
height of the user.
[0078]
According to the present invention, the monitoring monitor camera monitors the platform by
changing the viewing direction, and the speaker is incorporated in the monitoring monitor
camera so that the radiation direction of the voice announcement matches the viewing direction.
The effect of being able to provide an accurate voice announcement to the monitoring target
according to the monitoring state by the monitoring monitor camera is obtained.
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